<template>
  <el-container class="home-container">
    <!-- 页面头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container class="home-container">
      <!-- 侧边栏 -->
      <el-aside :width="!isCollapse?'200px':'64px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
        <el-menu
          router
          unique-opened
          :default-active='activePath'
          :collapse="isCollapse"
          :collapse-transition="false"
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409fff">
          <!-- 一级菜单 -->
          <el-submenu :index="item.id+''" :key="item.id" v-for="item in menuList">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <el-menu-item
              :index="'/'+subItem.path"
              :key="subItem.id"
              v-for="subItem in item.children"
              @click="saveNavState('/'+subItem.path)"
            >
               <!-- 2级菜单的模板区域 -->
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <el-main>
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data () {
    return {
      // 左侧菜单数据
      menuList: [],
      iconsObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      isCollapse: false,
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout: function () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    getMenuList: async function () {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
    },
    toggleCollapse: function () {
      this.isCollapse = !this.isCollapse
    },
    saveNavState: function (activePath) {
      this.activePath = activePath
      window.sessionStorage.setItem('activePath', activePath)
    }
  }
}
</script>

<style lang="less" scoped>
  .home-container {
    height: 100%
  }
  .el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-left: 0;
    color: #fff;
    font-size: 20px;
    > div {
      display: flex;
      align-items: center;
      > span {
        margin-left: 15px;
      }
    }
  }
  .el-aside {
    background-color: #333744;
  }
  .el-main {
    background-color: #eaeaf1;
  }
  .el-menu {
    border-right: none;
  }
  .iconfont {
      margin-right: 10px;
  }
  .toggle-button {
    background-color: #4a5064;
    font-size: 10px;
    line-height: 24px;
    text-align: center;
    color: #fff;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
</style>
